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A method for detecting the concentricity of the core package of optical fiber prefabricated rod
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An optical fiber preform and detection method technology, which is applied to measurement devices, mechanical measurement devices, and optical devices, etc., can solve problems such as inapplicability and increase production costs, and achieve accurate and reliable results.
Active Publication Date: 2021-09-24
JIANGSU FASTEN PHOTONICS +2
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Problems solved by technology
The concentricity testing equipment currently owned by the company has a certain range of application for the outer diameter of the light rod. As a new product, the large-size light rod is no longer suitable for the existing testing equipment.
The additional purchase of concentricity testing equipment suitable for large-size optical rods will undoubtedly increase the production cost of the enterprise
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Embodiment 1
[0042] The test method of the present invention is verified by taking a small-sized optical rod as the detection object.
[0043] Select an 80 rod (rod number: DJ0701B1), the core diameter measured by PK2600 is 5.08mm, the maximum concentricity of the core package is 0.39, and the average value is 0.325. The specific center deviation of the core package is as follows:
[0045] The values in the table are measured by the PK2600 after the light rod rotates 5 times (a total of one cycle). The larger the value, the greater the deviation between the two centers. 400 and 700 are the lengths from the two test sections sampled to the light baseball handle.
[0046] Depend on Figure 8 It can be seen that the core package deviation of the optical rod in ...
Embodiment 2
[0049] Take the large-size optical rod as the detection object to verify the test method of the present invention
[0050] Select a 120 rod (rod number: RI0902B2), because the concentricity of the optical rod cannot be directly detected by PK2600, so the optical rod is drawn, and after the heat preservation is completed, it directly enters the drawing process. The fiber exits, and the light rod is discarded. The fiber inspection results show that the maximum concentricity is 1.15 and the average value is 0.76.
[0051] Such as Figure 10 As shown, on the test platform built, adopt the core-pack concentricity detection method of the present invention to measure its fiber core projected outer diameter about 35.5mm, after rotating 180 °, the mandrel projected outer edge deviation measurement is respectively 8.3mm, 8.3mm, 7.2mm, 6.5mm, 5.8mm. Combined with its core diameter of 7.68mm, the concentricity of the core package can be calculated as 0.898mm, 0.779mm, 0.703mm, and 0.62...
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Abstract
The invention relates to a method for detecting the concentricity of the core package of an optical fiber prefabricated rod. The optical rod is arranged between the light source and the projection plate, and the three are in a line; the light source is turned on, and clear projections of the fiber core and outer cladding are obtained on the projection plate. , taking the centerline of the light rod as the rotation axis, taking the light rod to rotate 180° around the rotation axis as a detection cycle, taking the projection line of the light rod centerline on the projection board as the zero point line, and setting M along the length direction of the fiber core For the test section, M is an integer greater than 1. Every time a detection angle α is rotated in a detection cycle, the vertical distance difference between the two sides of the fiber core projection of each test section and the zero point line is recorded ∣d1‑d2∣, and a total of (180° / α)*M times, when ∣d1‑d2∣ is the largest, the line connecting the center of the outer cladding and the center of the fiber core is just perpendicular to the line connecting the center of the outer cladding and the center of the light source, using the formula D=1 / 2(∣d1 ‑d2∣)×(d 0 / (d1+d2)) to calculate the concentricity of the core of the optical rod, where d 0 is the actual detected outer diameter of the fiber core.
Description
technical field [0001] The invention relates to a method for detecting the concentricity of the core of an optical fiber prefabricated rod. Background technique [0002] The continuous development of the global communication industry has promoted the rapid growth of the demand for optical fiber, and the competition in the optical fiber industry has become increasingly fierce. In order to further reduce costs, increasing the size of the optical fiber upstream product optical fiber preform (also referred to as "optical rod" in this article), that is, "big rod" will help enterprises control manufacturing costs. [0003] At present, through the innovation of technology and production capacity, large-size optical fiber preforms with a diameter of over 150mm have been successfully manufactured. Compared with small-sized optical fiber preforms, the concentricity of large-sized optical fiber preforms is more difficult to control, and it is also an important factor that restricts th...
Claims
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